冷坩埚连续熔凝法制备Ti47Al合金扁锭  

Preparation of Ti47Al Rectangular Billets by Continuous Melting and Solidification with Cold Crucible

作　　者：陈瑞润[1] 丁宏升[2] 郭景杰[2] 毕维生[2] 苏彦庆[2] 刘林[1] 傅恒志[2] 

机构地区：[1]西北工业大学凝固技术国家重点实验室 [2]哈尔滨工业大学金属精密热加工国防重点实验室

出　　处：《特种铸造及有色合金》2008年第2期93-95,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金重大项目(50395102);国家自然科学基金资助项目(50671032)

摘　　要：研究了冷坩埚连续熔凝法制备的Ti47Al合金扁坯的表面质量、宏观和微观组织及力学性能。试验结果表明,扁坯的表面质量受电磁力的影响较大;试样经过一段生长区域后能形成平行于生长方向的柱状晶,但在试样的外侧有非定向的等轴晶区;定向晶粒由同一方向的片层组成,片层方向与抽拉方向平行或者成45°角;试样的宏观组织与表面颜色有准确的对应关系。压缩测试结果表明,定向凝固区域的试样比其他区域的试样具有更高的抗压强度。The surface morphology,macro-micro-hardness and compressive behavior of Ti47Al rectangular billets prepared by continuous melting and solidification with cold crucible have been investigated.The results indicate that the surface morphology of the rectangular billet is affected by electromagnetic force.The columnar crystal that is parallel to growth direction can be generated in the microstructure of the billets after a section of equiaxed or lathy grains,however,the undirectional equiaxed grain section can be observed in the outer-side of the billets.The directional structure in the billets consists of the lamellar structure that is parallel or nearby 45 °to the pulling direction.In addition,the microstructure of the billets is consistent with the surface color.The compressive testing reveals that the compressive strength of the billet at direction solidification region is superior to that of the other region ones.

关 键 词：冷坩埚 连续铸造 定向凝固 TIAL合金 

分 类 号：TG292[金属学及工艺—铸造]